(19)
(11) EP 0 255 442 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
28.03.1990 Bulletin 1990/13

(43) Date of publication A2:
03.02.1988 Bulletin 1988/05

(21) Application number: 87401766.8

(22) Date of filing: 29.07.1987
(51) International Patent Classification (IPC)4: H04L 12/28
(84) Designated Contracting States:
AT BE CH DE ES FR GB IT LI SE

(30) Priority: 30.07.1986 IT 2131086

(71) Applicants:
  • ALCATEL ITALIA S.p.A.
    I-20149 Milano (IT)

    IT 
  • ALCATEL N.V.
    NL-1077 XX Amsterdam (NL)

    BE CH DE ES FR GB LI SE AT 

(72) Inventors:
  • Valeri, Marco
    Rome (IT)
  • Rocchini, Carlo Alberto
    Rome (IT)

(74) Representative: Pothet, Jean Rémy Emile Ludovic et al
c/o SOSPI 14-16 rue de la Baume
75008 Paris
75008 Paris (FR)


(56) References cited: : 
   
       


    (54) Circuit device for implementing the access protocol for serial exchange of numerical informations among terminals interconnected by an optical fiber star network


    (57) The present invention relates to a device for imple­menting the access protocol for serial exchange of numerical informations among terminals interconnected by an optical fiber star network, using queuing state transmission in a small fraction of information channel capacity, thanks to a circuit for measuring the distance from each terminal to star center, which allows to synchronize the queuing state transmission mini­mizing the physical occupation of transmission channel, the delay queuing for accessing to the network being managed by an access algorithm, processed by the device itself, which is provided in each terminal of the network.







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